Oxidation of hydrocarbons and extraction of the oxidized products



- 10 place chie when all or nearly all ofthe initial materials has been converted into oxidation products.

meted Sept. 22, 1931;

UNITED s rEs mT I m'rm LUTHER, or AND nms'wmn, or LUDWIGSHAFEN-ON-T'HE- nrrmn, GERMANY, ASSIGNOHS '10 I. G. rmimmnus'rnm AKTIENGESELLSCEAFT, or rmxroRr-on-mE-rrm, (1mm, A conromrrou or GEBMANY+-+- OXIDATION OF HYDBOCABBONS AND EXTRACTION OF OXIDIZED PRODUCTS in Drawing. Application filed August 19, me, Serial 1m 130,652, and in eel-man rum, ms.

"When paraflin hydrocarbons, waxes and similar organic materials of rather high molecular weight are oxidized under strong conditions in order to obtain highly oxidized products, for example acids, dark colored and resinous bodies are formed as by-products of I rather small value. This is due to the fact that the primaril formed oxidation productsunder 0 further oxidation, which takes y near the end of the process We have now found that the initial material can be completelyconverted into valua-- 15 hle oxidation products without the formatlon of valueless by-products by removmg 'the'oxidized part from the reaction mixture before the oxldation is finished, and subjecta ing the non-oxidized part, if desired in mix ture with fresh initial material, again tothe -oxidizing treatment in the manner described;

The removal of the oxidation roduct from the reaction mixture may e ected' 111 any a suitable manner. For example the oxidatlon product may be removed from the reaction mass by-heating the latter only to such a high temperature that only the oxidation product which has a lower melting point than thev initial material, melts and is removed so from the mixture in the liquid state. It 1s,

however, of particular advantage to remove the oxidation products by a, treatment with solvents in which the said products are soluble, but in which the non-oxidized or not I as sufiiciently oxidized part of the initial mate-' rial is insoluble. By this method of work-- ing all of the initial material can be converted into a practically homogeneous, high- 1y oxidized, light-colored product.

As solvents suitable for carryrngout our present invention we mentionior example aliphatic alcohols, pyr dine or acetone and their homologues. It is often advantageous to emplo solventsl containing a small amount 0 water. The process can be carried out in an especially. advanta eous manner with methanol or mixed so vents con .taining methanoli y The highly oxidized products obtained by .60 oursaid process are very suitable for example -trate how our invention may be carried out acid.

The following exampleswill further illusin practice, but the invention is not limited to these examples.

Paraflin wax is oxidized for two hours by a current of air in the manner described in the German PatentNo. 405,850. The reaction mixture is treated at room temperature with about 10 times its weight of methanol. The resulting solution is separated from the non-oxidized part by filtration and evaporated. The residue obtained by ryqaporation of the solution amounts to about 'per cent of the initial material and has-a saponification number of above 200. The'residue insoluble iii methanol is mixed with paraflin wax, the mixture is oxidized, again treated with methanol in the manner described above and so forth.

-. An oxidation productobtained according to Example 1 is stirred for'2 hours with one third of its weight of sulfuric acid of 98 per-- cent strength at-35 G. Thereupon theex cess of sulfuric acid is. removed by washing with sodiumsulfate' solution. The resulting product forms stable emulsions with water when" ixed with from3to4 times its weight 100 ofspindle oil and 2 to 3 per of ammonia. v

We do not claim in this application the production of products of the character of Turkey red oil in the manner hereinbefore described, such process forming ject matter of another applicatlon for patent the ste p which I afiin hydrocarbons,

which has been divided out from this case What .we claim is:

1. In the process-of part1 aflin h drocarbons, waxes an materials in the liquid state unattacked initial material to oxidizing parrelated organic and returning the oxidation, comprises removing the oxidation roducts by treatmcntwith asolvent selected from the group consisting of methanol and acetone;

2. In the process of partly oxidizing parwaxes and related organic materials in the liquid state and returning unattacked initial material to the oxidation, the step which comprises removing the oxidation products by treatment with a solvent comprising acetone. 1

3. The process of oxidizing paraflin hydrocarbons, waxes and similar or anic materials which consists in partly oxi 'zing the said materials in the lfltlid state, removing the oxidation products ytreatment with a solvent comprising methanol, and subjecting the I residue anew. to oxidation.

In testimony whereof we have hereunto set our. hands. TIN LUTHER now the sub 

